/* ===== RESET & BASE ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #4361ee;
    --primary-dark: #3a56d4;
    --secondary-color: #7209b7;
    --accent-color: #f72585;
    --text-color: #2b2d42;
    --text-light: #8d99ae;
    --bg-color: #ffffff;
    --bg-light: #f8f9fa;
    --bg-dark: #edf2f4;
    --border-color: #e9ecef;
    --success-color: #4cc9f0;
    --warning-color: #f8961e;
    --danger-color: #f94144;
    --shadow: 0 2px 15px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.12);
    --radius: 12px;
    --radius-sm: 8px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    min-height: 100vh;
}

/* ===== TYPOGRAPHY ===== */
h1, h2, h3, h4 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
    color: var(--text-color);
}

h1 {
    font-size: 2.5rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

h2 {
    font-size: 1.75rem;
    position: relative;
    padding-bottom: 0.5rem;
}

h2:after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 3px;
    background: var(--primary-color);
    border-radius: 2px;
}

h3 {
    font-size: 1.375rem;
}

p {
    margin-bottom: 1rem;
    color: var(--text-light);
}

/* ===== LAYOUT ===== */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.main-content {
    padding: 40px 0;
    min-height: calc(100vh - 200px);
}

/* ===== HEADER ===== */
.site-header {
    background: var(--bg-color);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.95);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: bold;
    font-size: 1.25rem;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text-color);
}

.logo-text span {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* ===== NAVIGATION ===== */
.main-nav ul {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-link {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    padding: 0.5rem 0;
    position: relative;
    transition: var(--transition);
}

.nav-link:after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: var(--transition);
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
}

.nav-link:hover:after,
.nav-link.active:after {
    width: 100%;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-color);
}

/* ===== HERO SECTION ===== */
.hero {
    text-align: center;
    padding: 4rem 0;
    background: linear-gradient(135deg, rgba(67, 97, 238, 0.1) 0%, rgba(114, 9, 183, 0.1) 100%);
    border-radius: var(--radius);
    margin: 2rem 0;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.25rem;
    max-width: 600px;
    margin: 0 auto 2rem;
    color: var(--text-color);
}

.search-box {
    max-width: 600px;
    margin: 2rem auto;
    position: relative;
}

.search-input {
    width: 100%;
    padding: 1.25rem 1.5rem;
    padding-right: 60px;
    font-size: 1rem;
    border: 2px solid var(--border-color);
    border-radius: 50px;
    background: var(--bg-color);
    transition: var(--transition);
}

.search-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.1);
}

.search-btn {
    position: absolute;
    right: 5px;
    top: 50%;
    transform: translateY(-50%);
    background: var(--primary-color);
    color: white;
    border: none;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.search-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-50%) scale(1.05);
}

/* ===== CATEGORIES GRID ===== */
.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin: 3rem 0;
}

.category-card {
    background: var(--bg-color);
    border-radius: var(--radius);
    padding: 2rem;
    text-decoration: none;
    color: var(--text-color);
    transition: var(--transition);
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    height: 100%;
}

.category-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.category-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    color: white;
    font-size: 1.5rem;
}

.category-card h3 {
    margin-bottom: 0.5rem;
}

.category-card p {
    flex-grow: 1;
    margin-bottom: 1rem;
}

.category-count {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--primary-color);
    font-weight: 500;
    margin-top: auto;
}

/* ===== CALCULATORS GRID ===== */
.calculators-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.calculator-card {
    background: var(--bg-color);
    border-radius: var(--radius);
    padding: 1.5rem;
    border: 1px solid var(--border-color);
    transition: var(--transition);
    text-decoration: none;
    color: var(--text-color);
    display: block;
}

.calculator-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow);
    border-color: var(--primary-color);
}

.calculator-badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: rgba(67, 97, 238, 0.1);
    color: var(--primary-color);
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 1rem;
}

.calculator-card h3 {
    margin-bottom: 0.5rem;
    font-size: 1.25rem;
}

.calculator-card p {
    font-size: 0.9375rem;
    color: var(--text-light);
    margin-bottom: 0;
}

/* ===== BREADCRUMBS ===== */
.breadcrumbs {
    margin: 2rem 0;
    padding: 1rem 0;
    border-bottom: 1px solid var(--border-color);
}

.breadcrumbs ol {
    display: flex;
    flex-wrap: wrap;
    list-style: none;
    gap: 0.5rem;
    align-items: center;
}

.breadcrumbs a {
    color: var(--text-light);
    text-decoration: none;
    transition: var(--transition);
}

.breadcrumbs a:hover {
    color: var(--primary-color);
}

.breadcrumbs li:not(:last-child):after {
    content: '›';
    margin-left: 0.5rem;
    color: var(--text-light);
}

.breadcrumbs .current {
    color: var(--text-color);
    font-weight: 500;
}

/* ===== CALCULATOR PAGE ===== */
.calculator-page {
    margin: 2rem 0;
}

.calculator-header {
    text-align: center;
    margin-bottom: 3rem;
}

.calculator-header h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.calculator-wrapper {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 2rem;
    margin-bottom: 3rem;
}

@media (max-width: 768px) {
    .calculator-wrapper {
        grid-template-columns: 1fr;
    }
}

.calculator-container {
    background: var(--bg-color);
    border-radius: var(--radius);
    padding: 2rem;
    box-shadow: var(--shadow);
}

.calculator-info {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.info-card {
    background: var(--bg-color);
    border-radius: var(--radius);
    padding: 1.5rem;
    border: 1px solid var(--border-color);
}

.info-card h3 {
    font-size: 1.125rem;
    margin-bottom: 0.5rem;
}

.info-card p {
    font-size: 0.9375rem;
    margin-bottom: 0;
}

/* ===== FORM ELEMENTS ===== */
.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-color);
}

.form-input {
    width: 100%;
    padding: 0.875rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    transition: var(--transition);
    background: var(--bg-color);
}

.form-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.1);
}

.form-select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='%238d99ae' viewBox='0 0 16 16'%3E%3Cpath d='M7.247 11.14L2.451 5.658C1.885 5.013 2.345 4 3.204 4h9.592a1 1 0 0 1 .753 1.659l-4.796 5.48a1 1 0 0 1-1.506 0z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    background-size: 16px;
    padding-right: 3rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.875rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
    gap: 0.5rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(67, 97, 238, 0.3);
}

.btn-block {
    width: 100%;
}

/* ===== RESULT DISPLAY ===== */
.result-card {
    background: white;
    border-radius: var(--radius-sm);
    padding: 1.5rem;
    margin-bottom: 1rem;
    border-left: 4px solid var(--primary-color);
}

.result-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
    margin: 0.5rem 0;
}

.result-label {
    font-size: 0.875rem;
    color: var(--text-light);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* ===== SUBCATEGORIES ===== */
.subcategories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.subcategory-card {
    background: var(--bg-color);
    border-radius: var(--radius);
    padding: 1.5rem;
    border: 1px solid var(--border-color);
    transition: var(--transition);
    text-decoration: none;
    color: var(--text-color);
    display: flex;
    align-items: center;
    gap: 1rem;
}

.subcategory-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow);
    border-color: var(--primary-color);
}

.subcategory-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.25rem;
    flex-shrink: 0;
}

.subcategory-content {
    flex-grow: 1;
}

.subcategory-content h3 {
    margin-bottom: 0.25rem;
    font-size: 1.125rem;
}

.subcategory-content p {
    font-size: 0.875rem;
    margin-bottom: 0.5rem;
}

.calculator-count {
    font-size: 0.75rem;
    color: var(--primary-color);
    font-weight: 500;
}

/* ===== SEO CONTENT ===== */
.seo-content {
    margin-top: 3rem;
}

.seo-article {
    background: var(--bg-color);
    border-radius: var(--radius);
    padding: 2rem;
    box-shadow: var(--shadow);
}

.seo-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

.seo-card {
    background: var(--bg-light);
    border-radius: var(--radius);
    padding: 1.5rem;
    border-left: 4px solid var(--primary-color);
}

.seo-card h3 {
    font-size: 1.125rem;
    margin-bottom: 0.5rem;
}

.category-seo-content {
    margin-top: 3rem;
    padding: 2rem;
    background: var(--bg-light);
    border-radius: var(--radius);
}

.calculator-seo-content {
    margin-top: 3rem;
    padding: 2rem;
    background: var(--bg-light);
    border-radius: var(--radius);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.feature {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem;
    background: var(--bg-color);
    border-radius: var(--radius-sm);
}

.feature svg {
    color: var(--primary-color);
}

/* ===== FOOTER ===== */
.site-footer {
    background: var(--text-color);
    color: white;
    padding: 3rem 0 1.5rem;
    margin-top: 4rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
    margin-bottom: 2rem;
}

.footer-section h3 {
    color: white;
    margin-bottom: 1.5rem;
    font-size: 1.25rem;
}

.footer-section ul {
    list-style: none;
}

.footer-section li {
    margin-bottom: 0.75rem;
}

.footer-section a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: var(--transition);
}

.footer-section a:hover {
    color: white;
    padding-left: 5px;
}

.footer-bottom {
    text-align: center;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.875rem;
}

/* ===== UTILITY CLASSES ===== */
.text-center {
    text-align: center;
}

.mb-1 { margin-bottom: 0.25rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-3 { margin-bottom: 1rem; }
.mb-4 { margin-bottom: 1.5rem; }
.mb-5 { margin-bottom: 2rem; }

.mt-1 { margin-top: 0.25rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-3 { margin-top: 1rem; }
.mt-4 { margin-top: 1.5rem; }
.mt-5 { margin-top: 2rem; }

.hidden {
    display: none;
}

/* ===== ANIMATIONS ===== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 0.6s ease-out;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 992px) {
    h1 {
        font-size: 2rem;
    }
    
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .categories-grid {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    }
    
    .calculator-header h1 {
        font-size: 2rem;
    }
}

@media (max-width: 768px) {
    .main-nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--bg-color);
        box-shadow: var(--shadow);
        padding: 1rem;
    }
    
    .main-nav.active {
        display: block;
    }
    
    .main-nav ul {
        flex-direction: column;
        gap: 0;
    }
    
    .main-nav li {
        margin: 0.5rem 0;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    .header-inner {
        padding: 0.75rem 0;
    }
    
    .hero {
        padding: 2rem 0;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .hero p {
        font-size: 1rem;
    }
    
    .subcategories-grid {
        grid-template-columns: 1fr;
    }
    
    .calculator-wrapper {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .categories-grid {
        grid-template-columns: 1fr;
    }
    
    .calculators-grid {
        grid-template-columns: 1fr;
    }
    
    .subcategories-grid {
        grid-template-columns: 1fr;
    }
    
    .seo-grid {
        grid-template-columns: 1fr;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
}


/* ===== ALL CALCULATORS PAGE ===== */
.all-calculators-page {
    margin: 2rem 0;
}

.page-subtitle {
    font-size: 1.25rem;
    color: var(--text-light);
    margin-bottom: 2rem;
    max-width: 800px;
}

/* Фильтры */
.filters-section {
    background: var(--bg-color);
    border-radius: var(--radius);
    padding: 1.5rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow);
}

.filters-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.filter-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.filter-label {
    font-weight: 500;
    color: var(--text-color);
    font-size: 0.9375rem;
}

.filter-select,
.filter-input {
    padding: 0.75rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--bg-color);
    font-size: 1rem;
    transition: var(--transition);
}

.filter-select:focus,
.filter-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.1);
}

/* Счетчик */
.calculators-count {
    font-size: 1.125rem;
    color: var(--text-color);
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.calculators-count span {
    font-weight: 700;
    color: var(--primary-color);
}

/* Сетка всех калькуляторов */
.all-calculators-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.all-calculators-grid .calculator-card {
    height: 100%;
    display: flex;
    flex-direction: column;
}

.calculator-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1rem;
}

.calculator-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
    flex-shrink: 0;
}

.calculator-badge {
    display: inline-block;
    padding: 0.375rem 0.75rem;
    background: rgba(67, 97, 238, 0.1);
    color: var(--primary-color);
    border-radius: 50px;
    font-size: 0.8125rem;
    font-weight: 500;
}

.calculator-content {
    flex-grow: 1;
    margin-bottom: 1rem;
}

.calculator-content h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.calculator-content p {
    font-size: 0.9375rem;
    line-height: 1.5;
    margin-bottom: 0;
}

.calculator-footer {
    margin-top: auto;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.calculator-link {
    font-size: 0.9375rem;
    color: var(--primary-color);
    font-weight: 500;
    transition: var(--transition);
}

.calculator-card:hover .calculator-link {
    color: var(--primary-dark);
    transform: translateX(5px);
}

/* Сообщение "не найдено" */
.no-results {
    text-align: center;
    padding: 4rem 2rem;
    background: var(--bg-light);
    border-radius: var(--radius);
    margin: 2rem 0;
}

.no-results-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

.no-results h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.no-results p {
    color: var(--text-light);
    max-width: 400px;
    margin: 0 auto;
}

/* SEO контент страницы */
.page-seo-content {
    margin-top: 4rem;
    padding: 2rem;
    background: var(--bg-light);
    border-radius: var(--radius);
}

.seo-categories {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.seo-category {
    background: var(--bg-color);
    padding: 1.5rem;
    border-radius: var(--radius-sm);
    border-left: 4px solid var(--primary-color);
}

.seo-category h3 {
    font-size: 1.125rem;
    margin-bottom: 0.5rem;
}

.seo-category p {
    font-size: 0.9375rem;
    margin-bottom: 0;
}

.seo-faq {
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}

.seo-faq h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
}

.seo-faq ul {
    list-style: none;
    padding-left: 0;
}

.seo-faq li {
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
    color: var(--text-light);
}

.seo-faq li:before {
    content: '✓';
    position: absolute;
    left: 0;
    top: 0.5rem;
    color: var(--primary-color);
    font-weight: bold;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    .all-calculators-grid {
        grid-template-columns: 1fr;
    }
    
    .filters-grid {
        grid-template-columns: 1fr;
    }
    
    .seo-categories {
        grid-template-columns: 1fr;
    }
}


/* ===== NAVIGATION MENU ===== */
.main-nav ul {
    display: flex;
    list-style: none;
    gap: 1.5rem;
    align-items: center;
}

.main-nav li {
    position: relative;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    padding: 0.5rem 0;
    position: relative;
    transition: var(--transition);
    white-space: nowrap;
}

.nav-link:after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: var(--transition);
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
}

.nav-link:hover:after,
.nav-link.active:after {
    width: 100%;
}

.menu-icon {
    font-size: 1.125rem;
    line-height: 1;
}

/* Выпадающее меню для подкатегорий */
.main-nav li {
    position: relative;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background: white;
    min-width: 200px;
    box-shadow: var(--shadow-lg);
    border-radius: var(--radius);
    padding: 0.5rem;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    z-index: 1000;
}

.main-nav li:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-item {
    display: block;
    padding: 0.75rem 1rem;
    color: var(--text-color);
    text-decoration: none;
    border-radius: var(--radius-sm);
    transition: var(--transition);
    font-size: 0.9375rem;
}

.dropdown-item:hover,
.dropdown-item.active {
    background: var(--primary-color);
    color: white;
}

/* Мобильное меню */
.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    width: 40px;
    height: 40px;
    cursor: pointer;
    color: var(--text-color);
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.mobile-menu-btn:hover {
    background: var(--bg-light);
}

@media (max-width: 992px) {
    .main-nav {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        bottom: 0;
        background: white;
        padding: 1rem;
        transform: translateX(-100%);
        transition: transform 0.3s ease;
        overflow-y: auto;
        z-index: 1000;
        box-shadow: var(--shadow-lg);
    }
    
    .main-nav.active {
        transform: translateX(0);
    }
    
    .main-nav ul {
        flex-direction: column;
        gap: 0;
        align-items: stretch;
    }
    
    .main-nav li {
        width: 100%;
        border-bottom: 1px solid var(--border-color);
    }
    
    .nav-link {
        padding: 1rem;
        justify-content: space-between;
    }
    
    .nav-link:after {
        display: none;
    }
    
    .dropdown-menu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        padding: 0;
        background: var(--bg-light);
        border-radius: 0;
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease;
    }
    
    .main-nav li.active .dropdown-menu {
        max-height: 500px;
    }
    
    .dropdown-item {
        padding: 0.75rem 1rem 0.75rem 2rem;
        border-top: 1px solid var(--border-color);
    }
    
    .mobile-menu-btn {
        display: flex;
        align-items: center;
        justify-content: center;
    }
}

/* ===== CALCULATOR PAGE STYLES ===== */
.calculator-page {
    margin: 2rem 0;
}

/* SEO контент калькулятора */
.calculator-seo-content {
    margin-top: 3rem;
    padding: 2rem;
    background: var(--bg-light);
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
}

.calculator-seo-content h2 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.calculator-seo-content h2:after {
    display: none;
}

.calculator-seo-content p {
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.seo-description {
    margin: 2rem 0;
    padding: 1.5rem;
    background: white;
    border-radius: var(--radius-sm);
    border-left: 4px solid var(--primary-color);
}

.seo-description h3 {
    font-size: 1.125rem;
    margin-bottom: 0.75rem;
    color: var(--text-color);
}

/* Сетка похожих калькуляторов */
.related-calculators {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}

.related-calculators h3 {
    font-size: 1.25rem;
    margin-bottom: 1.5rem;
    color: var(--text-color);
}

.related-calculators .calculators-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-top: 1rem;
}

.related-calculators .calculator-card {
    background: white;
    border-radius: var(--radius);
    padding: 1.5rem;
    border: 1px solid var(--border-color);
    transition: var(--transition);
    text-decoration: none;
    color: var(--text-color);
    display: flex;
    flex-direction: column;
    height: 100%;
}

.related-calculators .calculator-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow);
    border-color: var(--primary-color);
}

.related-calculators .calculator-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.related-calculators .calculator-card h4 {
    font-size: 1.125rem;
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.related-calculators .calculator-card p {
    font-size: 0.875rem;
    color: var(--text-light);
    flex-grow: 1;
    margin-bottom: 0;
}

/* Адаптивность */
@media (max-width: 768px) {
    .calculator-seo-content {
        padding: 1.5rem;
    }
    
    .calculator-seo-content h2 {
        font-size: 1.25rem;
    }
    
    .seo-description {
        padding: 1rem;
    }
    
    .related-calculators .calculators-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .calculator-seo-content {
        padding: 1rem;
    }
    
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}